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		<title>three.js webgl - postprocessing manual ssaa</title>
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			<a href="http://threejs.org" target="_blank">three.js</a> - Unbiased Manual Supersamling Anti-Aliasing (SSAA) pass by <a href="https://clara.io" target="_blank">Ben Houston</a><br/><br/>
			This example shows how to unbias the rounding errors accumulated using high number of SSAA samples on a 8-bit per channel buffer.<br/><br/>
			Turn off the "unbiased" feature to see the banding that results from accumulated rounding errors.
		</div>

		<div id="container"></div>

		<script src="../build/three.js"></script>
		<script src="js/libs/stats.min.js"></script>
		<script src="js/libs/dat.gui.min.js"></script>

		<script src="js/shaders/CopyShader.js"></script>

		<script src="js/postprocessing/EffectComposer.js"></script>
		<script src="js/postprocessing/SSAARenderPass.js"></script>
		<script src="js/postprocessing/RenderPass.js"></script>
		<script src="js/postprocessing/MaskPass.js"></script>
		<script src="js/postprocessing/ShaderPass.js"></script>


		<script>

			var scene, renderer, composer, copyPass;
			var cameraP, ssaaRenderPassP;
			var cameraO, ssaaRenderPassO;
			var gui, stats, texture;

			var params = {
				sampleLevel: 4,
				renderToScreen: false,
				unbiased: true,
				camera: 'perspective',
				clearColor: 'black',
				clearAlpha: 1.0,
				autoRotate: true
		
			};

			init();
			animate();

			clearGui();

			function clearGui() {

				if ( gui ) gui.destroy();

				gui = new dat.GUI();

				gui.add( params, "unbiased" );
				gui.add( params, "renderToScreen" );
				gui.add( params, 'sampleLevel', {
					'Level 0: 1 Sample': 0,
					'Level 1: 2 Samples': 1,
					'Level 2: 4 Samples': 2,
					'Level 3: 8 Samples': 3,
					'Level 4: 16 Samples': 4,
					'Level 5: 32 Samples': 5
				} );
				gui.add( params, 'camera', [ 'perspective', 'orthographic' ] );
				gui.add( params, "clearColor", [ 'black', 'white', 'blue', 'green', 'red' ] );		
				gui.add( params, "clearAlpha", 0, 1 );		
				gui.add( params, "autoRotate" );
			
				gui.open();

			}

			function init() {

				container = document.getElementById( "container" );

				var width = window.innerWidth || 1;
				var height = window.innerHeight || 1;
				var aspect = width / height;
				var devicePixelRatio = window.devicePixelRatio || 1;

				renderer = new THREE.WebGLRenderer( { antialias: false } );
				renderer.setPixelRatio( devicePixelRatio );
				renderer.setSize( width, height );
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				container.appendChild( stats.dom );

				cameraP = new THREE.PerspectiveCamera( 65, aspect, 3, 10 );
				cameraP.position.z = 7;

				cameraO = new THREE.OrthographicCamera( width / - 2, width / 2, height / 2, height / - 2, 3, 10 );
				cameraO.position.z = 7;

				var fov = THREE.Math.degToRad( cameraP.fov );
				var hyperfocus = ( cameraP.near + cameraP.far ) / 2;
				var _height = 2 * Math.tan( fov / 2 ) * hyperfocus;
				cameraO.zoom = height / _height;


				scene = new THREE.Scene();

				group = new THREE.Object3D();
				scene.add( group );

				var light = new THREE.PointLight( 0xddffdd, 1.0 );
				light.position.z = 70;
				light.position.y = -70;
				light.position.x = -70;
				scene.add( light );

				var light2 = new THREE.PointLight( 0xffdddd, 1.0 );
				light2.position.z = 70;
				light2.position.x = -70;
				light2.position.y = 70;
				scene.add( light2 );

				var light3 = new THREE.PointLight( 0xddddff, 1.0 );
				light3.position.z = 70;
				light3.position.x = 70;
				light3.position.y = -70;
				scene.add( light3 );

				var light3 = new THREE.AmbientLight( 0xffffff, 0.05 );
				scene.add( light3 );

				var geometry = new THREE.SphereBufferGeometry( 3, 48, 24 );
				for ( var i = 0; i < 120; i ++ ) {

					var material = new THREE.MeshStandardMaterial();
					material.roughness = 0.5 * Math.random() + 0.25;
					material.metalness = 0;
					material.color.setHSL( Math.random(), 1.0, 0.3 );

					var mesh = new THREE.Mesh( geometry, material );
					mesh.position.x = Math.random() * 4 - 2;
					mesh.position.y = Math.random() * 4 - 2;
					mesh.position.z = Math.random() * 4 - 2;
					mesh.rotation.x = Math.random();
					mesh.rotation.y = Math.random();
					mesh.rotation.z = Math.random();

					mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 0.2 + 0.05;
					group.add( mesh );
				}

				// postprocessing

				composer = new THREE.EffectComposer( renderer );
				ssaaRenderPassP = new THREE.SSAARenderPass( scene, cameraP );
				composer.addPass( ssaaRenderPassP );
				ssaaRenderPassO = new THREE.SSAARenderPass( scene, cameraO );
				composer.addPass( ssaaRenderPassO );
				copyPass = new THREE.ShaderPass( THREE.CopyShader );
				copyPass.renderToScreen = true;
				composer.addPass( copyPass );

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				var width = window.innerWidth;
				var height = window.innerHeight;
				var aspect = width / height;

				cameraP.aspect = aspect;
				cameraO.updateProjectionMatrix();

				cameraO.left = - height * aspect;
				cameraO.right = height * aspect;
				cameraO.top = height;
				cameraO.bottom = - height;
				cameraO.updateProjectionMatrix();

				renderer.setSize( width, height );

				var pixelRatio = renderer.getPixelRatio();
				var newWidth  = Math.floor( width / pixelRatio ) || 1;
				var newHeight = Math.floor( height / pixelRatio ) || 1;
				composer.setSize( newWidth, newHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				stats.begin();

				if( params.autoRotate ) {
					for ( var i = 0; i < scene.children.length; i ++ ) {

						var child = scene.children[ i ];

						child.rotation.x += 0.005;
						child.rotation.y += 0.01;

					}
				}

				var newColor = ssaaRenderPassP.clearColor;
				switch( params.clearColor ) {
					case 'blue': newColor = 0x0000ff; break;
					case 'red': newColor = 0xff0000; break;
					case 'green': newColor = 0x00ff00; break;
					case 'white': newColor = 0xffffff; break;
					case 'black': newColor = 0x000000; break;
				}
				ssaaRenderPassP.clearColor = ssaaRenderPassO.clearColor = newColor;
				ssaaRenderPassP.clearAlpha = ssaaRenderPassO.clearAlpha = params.clearAlpha;

				ssaaRenderPassP.sampleLevel = ssaaRenderPassO.sampleLevel = params.sampleLevel;
				ssaaRenderPassP.unbiased = ssaaRenderPassO.unbiased = params.unbiased;

				ssaaRenderPassP.enabled = ( params.camera === 'perspective' );
				ssaaRenderPassO.enabled = ( params.camera === 'orthographic' );

				ssaaRenderPassP.renderToScreen = ssaaRenderPassO.renderToScreen = params.renderToScreen;
				copyPass.enabled = !params.renderToScreen;

				composer.render();

				stats.end();

			}

		</script>
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